That is interesting. I have a Star Leo3 at 162g, and it is more overstable than both of my Pipelines, which are 167-169g in Proline plastic. For me, the Pipelines have a distinct right turn/flip up early in the flight (RHBH).

It might be that Star Leo3 of yours just molded up more overstable. It happens. I'm preferring my Champ Leo3s more than my Stars right now, though the Swirly Star Hannah Leatherman Leo3s are also awesome and fly like the Champs. I'd taken the Pipeline out of my bag to experiment with other plastic, but it may be back in when Summer gives way to Fall...